design basic wind speed 设计基本风速
It's suggested that design basic wind speed based upon 50-year mean recurrence interval, and coefficient for importance of a structure taken as 1.
建议声屏障结构设计基本风速重现期取50年，风荷载应考虑活载风与极限风两种情况，重要性系数取1。
The meteorological gradient system has started observing basic elements, including wind speed, direction, temperature and moisture since 1979.
平均场系统从79年开始进行常规气象要素的观测，包括风速、风向、温度和湿度。
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